Occipital headaches are also called cervicogenic headaches. If they are of cervical disc origin there is tenderness when the lower cervical spine is gently palpated. I say gently, because too firm pressure may aggravate the headache. See: https://fibromyalgia001.wordpress.com/article/headache-of-cervical-origin-2qn8r9qkhe4vd-4/